Title : Regulation of ROMK1 channels by protein-tyrosine kinase and -tyrosine phosphatase.

Pub. Date : 2001 Mar 9

PMID : 11114300






5 Functional Relationships(s)
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1 Addition of phenylarsine oxide (PAO), an inhibitor of PTP, reversibly reduced K(+) current by 55% in oocytes coinjected with ROMK1 and cSrc. oxophenylarsine potassium inwardly rectifying channel subfamily J member 1 Homo sapiens
2 Addition of phenylarsine oxide (PAO), an inhibitor of PTP, reversibly reduced K(+) current by 55% in oocytes coinjected with ROMK1 and cSrc. oxophenylarsine potassium inwardly rectifying channel subfamily J member 1 Homo sapiens
3 Moreover, application of herbimycin A, an inhibitor of PTK, increased K(+) current by 120% and completely abolished the effect of PAO in oocytes coexpressing ROMK1 and cSrc. oxophenylarsine potassium inwardly rectifying channel subfamily J member 1 Homo sapiens
4 The effects of herbimycin A and PAO were absent in oocytes expressing the ROMK1 mutant R1Y337A in which the tyrosine residue at position 337 was mutated to alanine. oxophenylarsine potassium inwardly rectifying channel subfamily J member 1 Homo sapiens
5 Moreover, the effect of PAO was completely abolished by treatment of oocytes with 20% sucrose and 250 microg/ml concanavalin A, agents that inhibit the endocytosis of ROMK1 channels. oxophenylarsine potassium inwardly rectifying channel subfamily J member 1 Homo sapiens